*Broken down financials by property*Company rollup*Easy entry of expenses/income*Categories specific to re investing/landlordI do alot of rehab work and am going to start growing on that so I want to be able to show some improvements as part of increasing the capitl position (stuff that is rolled into a rehab loan) vs. actual expenses that can be deducted.I know my needs are pretty simple, shoud I go with quickbooks or something online.

No, never had that, I did have a trained german shepard that was house broken, left with a pee pad, toy, plenty of food and water to get through the night, never had a problem!

or other modern upgrades, yard space, basement, etc.

Not in todays world.But if the many upgrades and rehab were not detailed they may have missed them.

Examples are foundation work or restructuring the property, adding a bathroom, increasing the size of kitchen, building an addition,… These are considered high risk flips as costs for repair my substantially eat into profit or make it a loss unless you have done it before and know exactly what type of work you are getting into.For my first work, I am more interested in doing a rehab with most common improvements such as paint, carpet, broken windows, leaky roof, counter tops, garage doors ,…. that will prove me with a good learning experience as well as a reasonable profit as a bonus :-)

Could you have a water leak somewhere-- toilet, dripping sink, broken pipe?

Apparently, a broken water pipe, rain water coming in through the door, and perhaps a previous sewage backup introduced water into apartment and it was closed up for many months perhaps years.

It is also a 4 family.Over the years I have upgraded almost everything - new windows, new electrical service, seperated an old steam fired boiler to 4 seperate heating units for each apt., new roof ETC...Long as the house has "good Bones" which hopefully your SE can see by the basement and or looking at the house in detail and you are getting it for a good price I wouldn't let the age scare me.Has the plumbing been upgraded?

Read @Brandon Turner 's article on setting one up free (or paid to upgrade) and easy: How to Create an Awesome Lead Generating Website in Under an Hour with No Technical AbilitiesIt won't do anything for you if you don't drive people to it but no reason to not get it up and running.- Social networks are another low hanging fruit.

Finally, if 9 units are empty you can either rent them for more income or upgrade them to increase rent price and increase the value of your property.